Safety car equipment



Sept. 27, 1932. E. R. FITCH SAFETY CAR EQUIPMENT Filed Feb. 27, 1929INVENTOR 'ELLERY R. FITCH l BY Q/v/,f

ATTO NEY Patented Sept. 27, 1932 UNITED STATES PATENT `OFFICE.

ELLERY R. FITCH, 0F WESTWOOD, JERSEY, ASSIGNOR TO THE WESTINGHOUSE AIRBRAKE COMPANY, OF WILMERD'ING, PENNSYLVANIA, A CORPORATION OFPENNSYLVANIA SAFETY CAR EQUIPMENT Application led February 27, 1929.Serial No. 343,007.

This invention relates to Huid pressure brakes and car controllingapparatus and more particularly to safety car control equipment.

It has heretofore been proposed to provide a car-door and brakecontrolling equipment comprising a brake valve device having a dooropening position in which -fluid under pressure is supplied to apply thebrakes and Ais also supplied to a door engine to effect the opening ofthe car doors.

. With the above equipment, the vbrake cylinder pressure Will build upto the full pressure carried in the main reservoir if the brake valve isleft in door open position, and in order to avoid this and prevent `theunnecessary Waste of iiuid under pressure, it has also been proposed toprovide means for limiting the pressure offluid supplied to the brakecylinder in the door open position of the brake valve. The brake valvedevice of this equipment is also provided with another position forapplying the brakes without opening the car doors and in which thepressure in the brake cylinder'may be built up as desired to the llimitof pressure carried in the main reservoir.

In this latter equipment, in order to avoid a rough stop, it isnecessary that the operator apply the brakes and then graduate thepressure down as the car approaches astop, and then in order to open thecar doors it is nelcessary to move the brake valve handle to door openposition after gthe car has actually been brought to a stop, and in thisposition fluid under pressure is again supplied to the brake cylinder upto the pressure of the pressure limiting device.

It has been further proposed` to provide a fluid pressure brakeapparatus having means n by which the brakes may be applied in the dooropen position of the brake valve without opening;r the car doors unlessthe speed of the car has been reduced to a low degree such that the caris practically 4at a stop.

The principal object of my invention is to provide an improved fluidpressure brake and car door controlling apparatus by which Athedoors'are opened and the pressure of fluid supplied to the brakecylinder is limited when the car is moving at or under a predel terminedvlow speed and the brake valve device is operated to door open position.

Another object of my invention is to pro-` vide 'an improved fluidpressure brake and car door controlling apparatus which, when the car ismoving at or under a predetermined low speed and the brake valve deviceoperated to door open position, will operate to cause the doors to openand toeffect a limited, application of the brakes, and Which, when thecar is moving at speeds over said predetermined low speed and the brakevalve device operated to door open position, will operate to cause thedoors to open and effect a full application of the brakes.

Another objectrof my invention is to provide a safety car controlequipment by which a dead mans emergency application of the brakes isprevented when the pressure of Huid supplied to the brake cylinder islimited in efecting an application of the brakes with the car moving ator under `a predetermined low speed, or after the car has been broughtto a stop with the limited brake cylinder pressure.

A further object of my invention is to provide a safety car controlequipment having means operative by the usual door engine forcontrolling the opening'of the car motor control circuit When the cardoors are opened and for controllingthe closing of the circuit when thecar doors are closed.

Other objects and advantages will appear in the following more detaileddescription of the invention.

In the accompanying drawing, Figure l, is a diagrammatic view, mainly insection, of a fluid pressure brake and car door controlling apparatus,the brake valve device being shown in release position and the remainderof the equipment being shown in their proper positions with the` carbeing' propelled by the ca r motor at a speed greater than apredetermlned low speed; Fig. 2 is a fragmentary sectional view throughthe brake valve device showing the rotary valve thereof in serviceposition; Fig. 3 is a like sectionalview showing the .rotary valve inservicedoor open poeva sition and Fig. 4 is a sectional view of thecontroller handle device.

As shown in the drawing, the equipment may comprise abrake valve device1 having connections to a main reservoir pipe 2, leading to the usualmain reservoir 3, a straight air pipe 4, a door opening pipe 5, a doorclosing pipe 6,and an emergency pipe7. With a double end equipment, asimilar brake valve device with the same pipe connections is provided ateach end of the car. Each car o-a double end equipment is also providedwith a 'toot valve device 8, a controller handle and pilot valve device118, and with a door engine 9 at each end or the car.

Each car is also provided with a relay bra-ke controlling valve device10, an 'emergency valve device 11, a pressure limiting valve device 12,a magnet valve device 13, a

double check valve device 14, and a brake cylinder 15.

Each door engine may comprise a casing containing connected pistons 16and 17, the movement of the pistons to the left being adaptedto eiectthe closing of the doors and the movement to the right the opening ofthe car doors.

rihe pistons 16 and 17 are connected together by a toothed member 18which is adapted ,to be moved by said pistons to operate a meshingtoothed segment 19 secured to a door operating shaft 20.

Secured to the segment 19 is a connector 21 which, when the door isclosed, is adapted to connect contact terminals 22 and 23 mountedV inthe door engine casing and suitably insulated from each other and thecasing. The Contact terminal 22 is connected with the trolley wire 24over a wire 25, a magnet coil 26 of a contact switch device, a wire 27,aline switch 28, a wire 29, and the usual trolley wheel 30. The contactterminal 23 is connected to ground at 31.

The foot valve device 8 may comprise a casing containing a relay valve32 and a valve 34 adapted to be operated by a piston 35 and a footbutton 36 for cohtrolling communication from one side of the relay valve32 to the safety control pipe 37 The relay valve device 10 may compriseacasing having a piston chamber 38 connected to the door opening pipe 5,and containing a piston 39 having a luted stem 40 which is adapted toengage and control the operation of a valve 41 contained in a chamber 42for establishing or closing QE communication of the chamber 42 with achamber 43 at one side of the piston 39, the chamber 42 being con- ,60'nected to the mainfreservoir pipe 2. Also contained in the chamber 42`and interposed betweenthe valve 41 and the casing is a coil spring 44,the pressure of which is adapted to normally maintain the valve 41seated against a seat ring 45.

The emergency valve device 11 comprises gevaar@ a casing having a pistonchamber connected to the main reservoir pipe 2 by way 03": a passage 50,and containing a piston 47, and a valvechamber 48 containing a slidevalve 49 adapted to be operated by said piston, the valve chamber 48being connected through passage 50 with the main reservoir pipe 2. Thepiston. chamber is also connected to the emergency pipe 7 and is furtherconnected to the safety control pipe 3 7 through a passage and pipe 51and a valve chamber 52 at one side of the double check valve 53 of thedevice 14.

Leadin from the chamber 43 in the relay kvalve devlce 10 is a pipe 54and interposed in this pipe is a non-return check valve 55.

The pressure limiting valve device may comprise a casing having a valvechamber 56 containing a ball check valve 57 and connected to the pipe54, beyond the non-return side of the check valve 57, by a pipe y58..Mount` ed in the casing is a piston 59 having a stem 60 adapted toengage the valve 57 and said piston is subject to the pressure of aspring 61 contained in a chamber 62 at one side of the piston 59. Achamber 63 at the other side of the piston is connected to the straightair pipe 4 through a pipe 64, there being a non-return check valve 65interposed in the pipe 64.

The magnet valve device 13 comprises a magnet 66 which is adapted tocontrol the operation of double beat valves 67 and 68 contained in achamber 69 connected to the chamber 62 in the limiting valve device 12through a pipe and passage 70. The magnet 66 may be of the usual wellknown type comprising a hollow core about which there is a winding, andfurther comprising an armature having a stem extending through thehollow core into operative engagement with the valve 67. The valve 67 isadapted to control communication from a chamber 71, with which the pipe58 is connected, to the valve chamber 69. The valve 68 is adapted tocontrol communication from thel valve chamber 69 to a chamber 72 whichis connected to atmosphere through a passage 7 3 and 'which contains aspring 74 to the pressure of which the double beat valves 67 and 68 aresubject.

For propelling the car the usual electric motor 75 is employed, which iscontrolled by the usual motor controller (not shown). One

ance 81 interposed in the wire. The other' terminal of the coil 80 isconnected to ground 78 by the wire 79.

The coil when energized is adapted tol operate an armature 82 to such aposition that a connector 83 carried thereby connects contact terminals84 and 85 which are connected to wire 77 and to one terminal of themagnet 66 respectively, the other terminal (Sag the magnet beingconnected to ground at When the coil 26 of the rst mentioned magnetswitch device is energized, the armature 87 of said switch is operatedto such a position that a connector 88 connects contact terminals 89 and90. The contact terminal 89 is connected to the supply wire 27 andthecontact terminal 90 is connected by a'wire 92 to a Contact terminal 91arranged in the motor controller.

`The controller handle and pilot valve device 118 may comprise a casinghavinga p in 140 carried thereby and upon which a .safety controllerhandle 120 is pivotally mounted. One end of this handle 120 is providedwith a slot for receiving the upper end portion of a pin 141. The lowerend of* the pin 141 carries a nut 142 and interposedbetween this nut andthe-casing is a. spring 143, which tends to force the pin 141 downwardlyto engage one end of a lever 144 pivotallyvmounted on a pin 145 carriedby the casing.

valve 119 which is adapted in one position to establishcommunication'from the pipe 115 to the atmosphere and in anotherposition to close said communication. Y

In operation, with the brake valve device 1 in release position, fluidunder pressure from the main reservoir 3 is supplied to the pistonchamber 46 of the emergency valve device through pipe 2, a passage 93.inthe brake valve device, a port 94 in the rotary valve95 of the brakevalve device, a chamber at the top of the rotary` valve," a port, 96 inthe rotary valve, a passage 97, emergency pipe 7, and passage 51. Fluidunder pressure from the main reservoir is also suppliedto the valvechamber 48 in the emergency valve device through pipe 2 and passage50.

Since the pressures of Huid in the chambers 46 and 48 are substantiallyequal, the pressure of a spring 98 contained in the piston chamber 46,maintains the emergency piston 47 and associated slide valve 49 in itsright hand or release position, in which the brake cylinder is connectedto the atmosphere through a pipe and passage 99, a cavity 100 in theemergency slide valve, passage and pipe 4, a passage 101 inthe brakevalve device 1, a port 102 in the rotary valve 95 and an exhaust passageand-pipe 103.

From the port 96 in the rotary valve of the brake valve device, thepiston chamber 104 in the casing of the door engine is supplied withfuid under pressure by way of a cavity 105 in the rotary .valve seat, aport 106' and passage and pipe 6. The piston chamber 130. inthe casingof the door engine and containing the plston 16 is connected toatmosphere by way of Apipe and passage' 5 and a port 107 opening intothe port 102. With the chamber 104 'thus charged and thechamber 130connected *wire 24, the line switch 28 closed and the car doors closed,the coil 26, of one of the magnet switch devices, is energized, so thatthe connector 88 closes the circuit through the contact terminals 89 and90.

With the car in motion, and the motor controller in any power o nposition, a connector 131 4in the controller connects the Contactterminals 76 and 91 so that current is supplied over the wire 77 to thecar motor 7 5. Current from-the wire 77 also flows through theresistance. 81, coil 80 and wire 79 to ground 78, energizing said coilsothat the connector 88 of the magnet switch device closes the circuitthrough the magnet 66, thus energizing said magnet.

`Magnet 66 being energized, the magnetic pull of the core causesthemagnet armature and armature stem to move downwardly so that the valve67 is unseated and the valve 68 The lever 144 is adapted to operate apilot- 'long as the car is traveling'at an appreciable speed, thusmaintaining the magnet 66' of the magnet valveA device energized.

After cutting oit the power to the car lmotor, the operator may operatethe brake valve device 1 to service position, shown in Fig. 2 ofthedrawing, in which theatmospheric connection from the brake cvllnder.through passage 101 in the brake valve device and cavity 102 in therotary valve95 is closed oii' and a communication established throughthe medium of a port 108 in the rotary valve 95 through which fluid, atmain reservoir pressure, present in the usual cham ber above the rotaryvalve, is supplied to the brake cylinder 15 by way of 'passage- 101,pipe and passage 4, cavity 100 inthe emergency slide valve 49,'and.passage and pipe 99. v

Fluid under pressure thus supplied n through the pipe 4 also flows to achamber v 109 in the foot valve device, and when the pressure in thischamber is sufficient to overcome the pressure of a spring 110 containedin' a chamber 111 and acting on the valve 32, said valve will beunseated, so that fluid under pressure will flow to a chamber 112 at oneside of the piston 35 by way of a pasvalve 34 seated bythe use of thefoot button 36, or maintains the controller handle 120' depressed sothat the pin 141 does not engage the lever 144. Since the lever is notengaged by the pin 141, the pressure of the spring 122 maintains thepilot valve 119 seated. fShould the operator be incapacitated so that hecan no longer maintain either the foot button 36 or the controllerhandle 120 depressed, the valve 34 will be unseated, due to the pressureof a spring 121 contained in the chamber 114 in the Jfoot valve device,and the pilot valve 119 of the controller handle device 118 will beunseated against the pressure of a spring 122 contained in the pilotvalve chamber 123, so that fluid under pressure from the emergencypiston chamber 46 would be vented to the atmos here by way of passageand pipe 51, cham er 52 in the double check valve device 14, .pipe 37,past the unseated foot valve 34, through valve chamber 114, pipe 115past the unseated pilot valve 119, and

through the pilot valve chamber 123 and an` atmospheric passage 124.With the emergency piston chamber '46 thus vented to the atmosphere, thepressure of fluid in the emergency slide valve chamber 48, as suppliedfrom the main reservoir 3 through pipe 2 and passage 50, causes theemergency piston 47to move to its extreme left hand position against thepressure of the spring 98, carrying with it the slide valve 49. When theslide valve 49 is thus shifted, it uncovers the pasi sage 99 so thatluid under pressure flows from the slide valve chamber 48 to the brakecylinder 15 through the passage and pipe 99, thus effecting an emergencyapplication of the brakes.

As the speed of the car'is reduced, the operator, by the use of thebrake valve device 1, may gradually reduce the brake cylinder pressureto bring the car to a gentle stop. Now when the speed of the car hasbeen reduced to some low speed, say for instance to a speed of threemiles pe1= hour, the counterelectro-motive force of the-car motor willnot be sucient to energize the coil 80, so that the connector 83 will beoperated out of contact with the contact terminals84 and 85, causing themagnet 66 to be deenergized. With the magnet 66 thus deenergized, thepressure of the spring 74 causes the valve 67 to seat and the :valve 68to unseat.

yThe operator may now operate the brake valve device ,to door open brakeapplied position, in'whi'ch the passage .101 leadingto the straight airpipe 4 is lapped and fluid at main reservoir pressure present in thechamber over the rotary valvey is suppliedl to the door opening passageand pipe 5 through a port 116 in the rotary valve. With the door engine9 is vented to the atmosphere through the door, closing pipe andpassacre 6, a cavity 117 in the rotary valvel 95, an eX- haust passageand pipe 103.

Fluid under pressure ilows from the pipe 5 to thepiston chamber 38 inthe relay valve device 10, causing the piston 39 to move toward theright, unseating the valve 41 so that fluid at main reservoir pressurein the chamber 42 flows past the unseated valve to the brake cylinder byway of chamber 43 in therelay valve device, pipe 54, check valve 55,pipe 58, limiting valve chamber 56, past the unseated valve 57 andaround the stem 60 of the piston 59, piston chamber 63, pipe 64, checkvalve 65, pipe and passage 4, cavity in the emergency slide valve 49 andpassage and pipe 99.

Since the valve 68 of the magnet valve device 13 is unseated, thechamber 62 in the pressure limiting valve device 12 is vented to theatmosphere through pipe and passage 70, valve chamber 69 in themagnetvalve device, past the unseated valve 68, chamber 72, andatmospheric passage 73.

Now when brake cylinder pressure present in chamber 63 in the limitingvalve device.

becomes great enough to overcome the pressure of the spring 61, thepiston 59 will move downwardly and permit the valve 57 to seat and closeoff the further supply of fluid under pressure to the brake cylinder. Bythus limiting the brake cylinder pressure, the car will come to a stopgently.

Since the pipe'4 is connected to the chamber 109 in the foot valvedevice, said chamber will be charged with fluid at brake cylinderpressure which may not be suflicient to unseat the valve 32 to supplyfluid under pressure to the piston chamber 112 and maintain the valve 34seated. To insure the seating of the valve 34, when the brake cylinderpressure is limited, iiuid at main reservoir pressure is supplied to thepiston chamber 112 through pipe 58, chamber 111,- and passage 113.

F luidunder pressure from the door opening pipe 5 also flows to thepiston chamber in the door engine, and since the chainber 104 in thedoor engine is vented to the atmosphere as hereinbefore described, thepressure of fluid in chamber 130 causes the door engine pistons 16 and17 to move to the right to their door open position. `When the car doorsare being operated t-o .their open positions, the connector 21, which isattached to the segment 19 of the doo engine 9, is

4moved out of connecting engagement with .the contact terminals 22 and23'so that the nals 89 and 90. With the connector 88 in this position,the car motor circuit is open and can only be closed by the closing ofthe doors it will thus be seen that the operator cannot start the carbefore the doors are closed.

' It will be seen that by limiting the brake cylinder pressure when thespeedof the car` than three miles per hour, the magnet 66 of the magnetvalve device 13 will be energized, so that iiuid under pressure williiow from the pipe 58 to thechamber 62 in the limiting valve device 12through a chamber 71 in the magnet valve device 13, past the unseatedlvalve 67, through chamber 69 and passage and pipe 70. Now since thepressures in the chambers 62 and 63 in the limiting valve device aresubstantially equal, the pressure of thespring 61 maintains the piston59 in its upper position in which the valve '57 is maintained unseated,thus permitting iuid under pressure to dow to the brake cylinder withoutlimitation by the limiting valve device.

The term low speed as used in the foregoing description and lappendedclaims is in` tended to mean a speed at which it would be safe to openthe car doors preparatory to bringing the car to a stop.

While one illustrative embodiment ofthe not my intention to limit itsscope to that embodiment or otherwisetha-n by the terms of the appendedclaims.

Having -now described my invention, what I claim 4as new and desire tosecure byr Letters Patent, is

1. n a vehicle controlling pparatus, the

combination with mechanism for controlling the opening and closin of acar door and mechanism for control in the applicat1on and release ofthecar br es, cf means for controlling the operation of the first `men`tioned mechanism to effect theJ opening of the car door-and forcontrolling the operation of the second mentioned mechanism to elect anapplication of the brakes, and means operative to limit the brakingpower of the second mentioned mechanism whenlthe speed of the car isreduced to a predetermined-low degree and the first mentioned means .isoperated to control the opening of the car door and the electing of anapplication of the brakes.

2. In a vehicle controlling apparatus the combination with mechanism forcontrolling the opening and closing of a cardoor and mechanism forcontrolling the .application and release of the car brakes, of means forcontrollin the operation of the first mentioned mec anism to eiiect theopening of the car door and for controlling the operation of the secondmentioned mechanism to eiect an application of the brakes, and meansoperative in accordance with the speed of the car and when the iirstmentioned means is Ioperated to eii'ect the opening of said door and anapplication of the brakes for, governing the braking power of the secondmentioned mechanism. g

3. In a vehicle controlling apparatus the combination with mechanism forcontrolling the opening and closing of a car door and mechanism forcontrolling the application and release of the'car brakes, of. means forcontrolling the operation ofthe first mentioned mechanism to eilect theopening of the car door and for controlling the operation of the secondmentioned mechanism to eliect an application of the brakes, andelectrically controlled means operative in -accordance with the speed ofthe car and when the i st mentioned means is operated to eliect t e`opening of said door and an application of the brakes for governing thebraking power of the second mentioned mechanism.

4. In a vehicle controlling apparatus, the combination with mechanismfor controlling y the opening 'and closingA of a car door and mechanismfor controlling the application and release of the car brakes, of meansfor controlling the operation of both of said mechanisms forsimultaneously opening said door and effecting an application 011:' thebrakes, and electrically controlled means operative according to thespeedy of the car for limiting the braking power of the second mentionedmechanism.

5. In a vehicle controlling apparatus, the combination with mechanismfor controlling the opening and-closin of a. car door and mechanism forcontrolling the application and release of the car brakes, of means forcontrolling the operation of both of Said mechanismsv for simultaneouslyopening said 'door and effecting an application of the cation of thebrakes, mechanism for controlling the opening andk closing of a cardoor, means for supplying fluid under pressure to Vsaid mechanism toeffect the opening of said -door and for operating said valve means tosupply Huid under pressure to the brake cyllnder, and means operative inaccordance with the speed of the car for governing the pressure of fluidsupplied to the brake cylinder.

7. In a vehicle controlling apparatus, the combination with. a brakecylinder, of valve means operative to supply fluid under pressure to thebrake cylinder to effect an application of the brakes, mechanism forcontrolling the'opening and closing of a car door, means for supplyingfluid under pressure to said mechanism to eliect the opening of saiddoor and for operating said valve means to supply fluid under pressureto the brake cylinder, and means operative when the speed of the car isat a low degree for limiting the pressure of fluid supplid to the brakecylinder. f'

8. In a vehicle controlling apparatus, the combination With a brakecylinder, of valve means operative to supply fluid under pressure to thebrake c `linder to eect an application of the bra es, mechanism forcontrolling the opening and closing of a car door, means for supplyingfluid under pressure to said mechanism to eliect the opening of saiddoor andfor operating said valve means to supply fluid under pressure tothe brake cylinder, and means operative when the car is moving at slowspeed and when the first mentioned means are operated tovopen the doorand supply fluid under pressure to the brake cylinder for limiting thepressure of Huid supplied to the brake cylinder.

9. ,In a vehicle controlling apparatus, the combination with a brakecylinder, of valve means operative to supply iuid under pressure to thebrake c linder to' effect an ap plication of the bra es, mechanism forcontrolling the opening and closing of a car door, means for supplyingluid under pressure to said mechanism to eii'ect the opening of saiddoor and for operating said valve means to supply Huid under pressuretothe brake cylinder, a valve device for governing the pressure ofcylinder, and means operable according to the speed of the car forcontrolling the operation of the last mentioned valve device.

10. In a vehicle controlling apparatus, the combination with a brakecylinder, of valve means operative to supply uid under pressure to thebrake cylinder to elect an application of the-brakes, mechanism forcontrolling the opening and closing of a car door, means for supplyingiiuid under pressure to said mechanism to elect the opening of sai doorand for operating said valve means to supply fluid under pressure to thebrake cylinder, a limiting valve device for limiting the pressure ofiluid supplied to the brake cylinder when said mea'ns is operated toeffeet the opening of said door and .when the car is in motion at lowspeed, and means operative according to the speed of the car forcontrolling the operation of said limiting valve device.

11. In a vehicle controlling apparatus, 4the combination with a brakecylinder, of valve uid supplied to the brakev d hicle motor. y

means operative tov supply fluid under pressure to the brake cylinder toeect an application of the brakes, mechanism for controlling the openingand closing of a car door, means for supplying fluid under pressure tosaid mechanism to eect the opening of said door and for operating saidvalve means to supply fluid under pressure to the brake cylinder, alimiting valve device for limiting the pressure of fluid supplied to thebrake cylinder when said means is operated to efect the opening of saiddoor and when the car is in motion at 10W speed, means operableelectrically for controlling the operation of saidylimiting valve deviceand means operable accordmg to the speed of the car for controlling theoperation of the electrically operable means.

12. In a vehicle controlling apparatus, the combination with a brakecylinder, of valve means operative to supply iiuidunder pressure to thebrake cylinder to e'ect an application of the brakes, mechanism Jforcontrolling the opening and closing of a car door, means for supplyingfluid under pressure to said mechanism to el'ect the opening of saiddoor and for operating said valve means to supply liuid under pressureto the brake cyl'- inder, a limiting valve device for limiting thepressure of iluid supplied to the brake cylinder when said means isoperated to effect the opening of said door and when the car is inmotion at low speed, a magnet valve device or controlling the operationof said limiting valve device, and electric circuit for said magnet`valve device, and a magnet switch device operable according to the speedof the car for cont-rolling the opening and closing of said circuit tocontrol the operation of said magnetvalve device.

13. In a controlling apparatus for a motor drivenrvehicle, thecombination with mechanism for controlling a vehicle door and mechanismfor controlling the vehicle brakes, and

means operative to cause both of said mechanisms to operate to eliectthe simultaneous opening ofthe door and the application of t e brakes,and means for governing the braking force of the second mentionedmechanism, including an electrically controlled device having itscircuit controlled according to the counter-electro-motive force of theve- 14. In a vehicle controlling apparatus, the combination with anelectric motor for propelling the vehicle and a circuit for supplyinganelectric current to operate Said motor, of

a doorV engine for controlling the opening and closing of a door of thevehicle when the vehicle is in motion at any speed or at a stop, f

and means operated lupon .movement of the door engineA at any time tothe position for opening the door for eiectingvt-he opening of the motorcircuit.

15. In a. vehicle controlling apparatus, the

vehicle is in motion at any speed or at a stop,

and means o erated by said door engine for controlling tlhe opening andclosing of the motor circuit.

16. In a vehicle controlling apparatus, the

,combination with an electric motor for propelling the vehicle and acircuit for supplying an electric current to operate said motor, of adoor engine for controlling the openin and closing of a door of thevehicle when t e vehicle is inmotion at any speed or at a stop, andmeans operated upon movement of the door engine at any time to theposition for opening the door for eiiecting the opening ofthe motorcircuit and operated upon movement of the door engine at any time to theposition for closing the door for effecting the closing of the motorcircuit.

17. lIn a vehicle controlling apparatus, the combination with anelectric motor for propelling the vehicle and a circuit for supplying anelectric current to operatesaid motor,

of a door engine for controlling the opening and closing of a door ofthe vehicle when the vehicle is in motion at any speed or at a stop,electrically controlled means for opening and closing the motor circuit,and means operative by said door engine for controlling the operationoffs'aid electrically controlled means. v 18. In a vehicle controllingappartus, the combination with 'an electric motor for propelling thevehicle and a circuit for supplying an electric current to operate saidmotor, of a door engine for controlling the opening and closing of adoor'of the vehicle when the vehicle is in motion at any speed or at astop,

Aa magnet switch device operative upon ienergization to close the motorcircuit and upon deenergization to open said circ it, and means,

operated by said door engine f r controlling the energization anddeenergiz'ation of said' magnet switch device.

19. In a vehicle controlling ap aratus, the combination with an electricmo or for'propellin g the vehicle and a circuit for supplying anelectric current to operate said motor, of a doorl engine forcontrolling the 'opening and closing of a door of the vehicle'when thecar is in motion at any speed or at a stop, a magnet switch deviceoperative upon ener-V gization to close the motor circuit and upondeenergization to open said circuit, and means operated by said doorengine upon effecting the opening of the car door for effecting thedeenergization of said magnet switch device.

20. In a vehicle controlling apparatus, the

combination with an electric motor-"for propelling the vehicle and acircuit for supplying an electric current to operate said motor,

of a door engine for controlling the opening and closing of a door ofthe' vehicle when the vehicle is in motion'at any speed or at a stop, amagnet switch device operative upon energization to close the motorcircuit and upon deenergization to open said circuit, and an electricswitch operated by said door engine for controlling the energization anddeenergization of said magnet switch device.

21. In a vehicle controlling apparatus, the combination with means foreffecting an application of the brakes when the operator becomeincapacitated and means for effecting a service application of thebrakes, of means operative automatically according v to the speed of thecar-for limiting the braking power of the second mentioned means when aservice application of the brakes is edected with the vehicle moving ata low speed, and

vmeans for preventing the operation of the first mentioned means toeffect an application of the brakes when the braking second mentionedmeans is limited.

22. In a vehicle controlling apparatus, the combination with a .doorengine operated by fluid under pressure for effecting the opening of adoor of the vehicle,

a door opening pipe, a fluid press-ure supply pipe, a brake valve devicefor establishing communication through which fluid under pressure issupplied from said supply pipe to said door opening pipe and a brakecylinder, of a valve operative to supply fluid under 'pressure from saidsupply pipe to the brake cylinder to effect an application of thebrakes, an abutment subject to the pressure of fluid supplied to saiddoor .opening pipe for operating said valve to 'supply fluid underpressure to the brake cylinder, and means controlled accorde ing to thespeed of thej'vehicle for governing the supply of fluid under pressureto the brake cylinder.

23. In a vehicle controlling apparatus, the l combination with adevice'for effecting an emergency application of the brakes when theoperator becomes incapacitated, of 21S-main reservoir pipe, a valveoperative to supply iiuid under pressure from said main reservoir pipeto effect an application of the brakes and to prevent the operation ofsaid device to effect an emergency application of the power of thebrakes, a door engine operated by Huid under I pressure for effectingthe opening of a door e of the vehicle and a piston subject to thepressure of fluid supplied to said door engine for operating said valve.

24. In a vehicle controlling apparatus, the combination with a doorengine operated by fluid under pressure for effecting the opening of adoor of the vehicle, a main reservoir, a brake c linder and a Avalvedevice operated by; fluidy under pressure for preventing an emergencyapplication of the brakes, of a straight air pipe through which fluidunder pressure is supplied at one time to the brake cylinder foreilectingan application of the brakes and to said valve device, a valveoperative to supply fluid under pressure at another time from said mainreservoir'to the brake 5 cylinder and to said valve' device, and anabutment subject to the pressure of fluid supplied to said door enginefor -operating said valve.

25. ln a vehicle controlling apparatus, the

i@ combination with a door engine operatedvby iiuid under` pressure foreectin'g the opening of a door of the vehicle, a main reservoir, a brakecylinder and a valve device operated by fluid under presure'forpreventing an emergency application of the brakes, of a straight airpipe through 4which fluid under pressure is'sup lied at one time to thebrake cylinder for e eating an application'o the brakes and to saidvalve device, valve means subject to the pressure of fluid supplied tosaid door engine Afonat another time supplying fluid under pressure fromthe main reservoir to the brake cylinder for edecting an application ofthe brakes and to said valve device, and means for limiting the supplyof fluid under pressure from said valve means to the brake cylinder.

26. In a vehicle controlling apparatus, the combination with a doorengine operated by 9@ iluid under pressure for effecting the opening ofadoor of the vehicle, al main reservoir, a brake cylinder and a valvedevice operated by iuid under pressure for preventing an emergencyapplication of the brakes, of a straight air pipe through which fluidunder pressure is supplied at one time to the brake cylinder foreffecting an application of the brakes and to said valve device, valvemeans subject to the pressure of uid supplied to saiderdoor engine forat another time supplying fluid under pressure from the main reservoirto the y brake cylinder for eecting an application of the brakes 'and tosaid valve device, and means controlled according to the speed of thevehicle for controlling the supply of fluid under pressure from saidvalve means to the brake cylinder. f t

27. In a vehicle controlling apparatus, the combination with an electricmotor :for propelling the vehicle and a circuit for supplying anelectric current to operate said motor, of a door engine for controllingthe opening and closing 0f a door of the vehicle when the vehicle is inmotion at any speed or at a stop 55, and for controlling the opening andclosing of the motor circuit. I

. In testimony. whereof I have hereunto set my hand, this 26th dayofFebruary, 1929.

. ELLERY R. FITCH.

